Radio recording means



Aug. 18, 1931.

R. M. CRAIG RADIO RECORDING MEANS Filed Sept. 5. 1929 2 Sheets-Sheet l I mm R. M Cr'mia. Z 4 I Aug. 18, 1931. R. M; CRAIG RADIO nncomame mamas 2- Sheets-Sheet 2 Filed Sep'lw 5, 1929 'IL'AJEJZXWLLJ'AWIIIIIIIIIIIIIIZ- awucnfoz M' Crate}.

ADIO AMPUflER Patented Aug. 18, 1931 I This'invention has forits objectthe provision of means wherebya'selection heard through a radio receiving set may. be recorded as it isreceived and the record played -i55-ba ck through the receiver as often as desired. The invention provides means whereby,- :if so :desired, the record may be-erased or: nullified and a different selection recorded on the same record'member, although .a plu i rality of record blanks maybeprovided and the records made thereon stored for future use at suchintervals asmay meet wishes or :taste. ofthe owner. It frequently happens that radio listeners are attracted or specially "*iwentertained by some musical selection or some remarks that are being received through the radio set and have a desireto hearsuch se lection or'remarks repeated, and the present invention provides means for supplying such want. Many radio-receiving sets at the pre's- 18 provided therefor at the ends of a bracket 1 9 which is disposed in radial relation .to the shaft land is provided at its inner end with a hub ore-sleeve .10 loosely encircling the shaft dfbelow the pinion 5 whereby 'the bracket 70 (mt time are built into cabinets which contain a phonograph attachmentwhereby phonograph records 'may be playedan'd heard v, through the instrumentality of a magnetic pick-up device which converts the sound Waves ofqthe record into'electric pulsations which are sent into the radio amplifier'and "there reconverted into sound, and this in- -5 ;vention is especially adapted to such instruments. 7

accompanying drawings and will be hereinafterfully set forth.

a In the drawings x Figure 1 is a plan-view ofva' cabinet having a pick-up device whereby phonograph records may be playedthrough a radio amplijfier, the top of the cabinet being removed 7 and the recording device of the present in- J ,Vention being illustrated, l 1

.Fig.-2 is a vertical section on the line 22 ofv Fig. 1 with the recording mechanism in elevation, r i Fig. 3 is a sectional elevation on the line 4673 -3 of Fig. 1', 1 it magnetic recording stylus, and p Fig. 5Y'is a diagram, showing the circuits 7 through vwhich the'record is made 'andthen The invention is illustrated in the nrcrmnn M": cIt IGQor sAiv amqa m s Q if nanro RECORDING MEL-ANS V a, Y I 5 Ap lication-filed September 5;1929, $eria1-No.390,638.

4 is an enlarged detail section oftlie replayed-through the pick-up device.

In the drawings, the reference numeral 1 indicates a cabinet which maybe of. any of the forms now on llllB'HlflIkGQQijhlS cabinet containing a horizontal shelf or partition 2 above whichis a turntable 8 andbelow which is amotor (not-shown) whereby the turntablema-y be rotated,v The turntable isv secured concentrically upon the upperend-of a vertical Shaftl which is journaled in and extends through the shelf and is driven di- '50 rectly by themotor, iUponthis shaft above the shelf, is a beveled pinion 5 which meshes with a similar pinion 6 on the inner end ofa threaded shaft 7 as shown most clearly in Fig. 2. The shaft 7 is j ournaled in bearings'pti and the shaft 7 may have a pivota'lmoveme'nt about the shaft ll, Pivotally mounted upon the shelf-2 at-the' rear of the turntable isa 7 post 11 having a forkedupper'end and in 7, as shown at 13', and equipped at. the" end of said arm 13 with arnut '14 resting on and meshing with the threads of the shaft 7. "An- 8 intermediate portion of the lever 12 rises from the fulcrum of the lever to a point-above the plane of-the'turntab'le and then-extends forwardly over the'turntable, as shown at 15.

' 'Pivoted to the end oft-he arm 15 of the-lever 35 is a carrier arm 16 to the free end of which is secured a magnetic coil 17 having a soft iron being tapered, as shown at 19,- t'o constitute.

' that the recording instrumenality is disposed at one side of a diameter of the turntable and -may be opened or closed.

cabinet and at the opposite side of said diam: eter is located the pick-up device 21 which is ordinarily employed for electrically playing the phonograph records. 7

Referring to Fig. 5 of the drawings, a radio amplifier 22 is indicated conventionally and at 23 is conventionally illustrated the loud speaker which is electrically connected with the amplifier. Wires 24 are tapped into the wires connecting the loud speaker with the amplifier and these wires are carried into the winding of the magnet 17, as shown in Fig. 5, a switch 25 being interposed in the wires 24 so that the circuit may be broken or closed at will. At the detector side of the receiving set, wires 26 are connected thereinto and these wires lead to the phonograph pick-up device, as indicated at 27, while branches 28 extend to a point adjacent the switch 25 whereby they may be coupled to the magnet 17 when the recorded selection isto be played.

. At 29 is indicated a battery and at 30 is a switch whereby the circuit of said battery This battery is connected into the coil of the magnet 17 and :the switch 30 is normally open.

When it is desired to record a selection by the use of my device, the pick-up arm 21 I is pushed to one side, as shown in Fig. 1, and

the steel disk 30 is substituted for any record which may happen to be upon the turntable or if no record is on the turntable then, of course, the steel disk is simply placed upon the table. The turntable is preferably of wood or fiber and is generally covered with felt so that it will be non-magnetic and will not interfere with the magnetism of the disk. The switch 25 is closed so as to connect the magnet 17 with'the amplifying side of the radio receiver'and, consequently, the core 18 of the magnet will be magnetized and, as it is resting upon'the disk 20, magnetism will be imparted to the disk, as will be'understood.

The turntable is set in motion as the recording operation starts and the magnetic stylus will,- consequently, travel over the table in a spiral path corresponding to the spiral path of sound records made upon the ordinary phonograph disk, and the pivotal mounting of the arm 9 permits it to conform'to the varying angular position of the recorder and the nut 14 which connects the recording bracket or lever with the threaded shaft. The rotation of'the turntable and the shaft carrying the same is transmitted through the pinions 5 and 6 to the threaded shaft 7 which, in turn, causes'travel of the and one-half times as long as the matter nut 14 and thereby swings the angle lever 12 and the recording stylus carried thereby about the supporting post 11 asa center in an obvious manner. The impulses passing over the wires 24 will obviously vary in strength in exact consonance or sympathy with the impulses passing to the loud speaker, and these impulses, flowing through the coil 17 will magnetize the core 18 to a greater or less degree and, consequently, will vary the intensity of the magnetism induced in the steel disk by the soft iron core 18. The disk,being steel, will retain its magnetism so as to constitute a record. When the selection has been recorded, the switch 25 isopened and the lever 12 is rocked about its fulcrum so that the magnet will be raised from the record and the nut 14 will be raised from [the threaded shaft 7; The magnet and the nut are then swung to the point at which 35 the making'of the record was begun and then reengaged with the .recorddisk and the threaded shaft respectively. The switch 25 is then thrown over-so thatqthe wires 28will be connected with thecoil, and if .the "turn-.- table be'then againrotated', therecord will be reproduced through the radio detector the loud speaker as sound waves;

VVhen-it is desired-to erase the -recorcl,:the2' switch 25 is set ina neutral open position-and the switch 30 is closed thereby sending a direct even current through :the coil 17f and,

consequently, equalizing the magnetism in the disk so thatthe variations which con-=3;

505 stitute the magnetic 're'cordwill no longer exist.

My recording attachment is very simple in its construction and operation and may be very easily applied toexisting instruments without involving heavy expense. I have been able with theuse of a steel disk .haivinga diameter the same as an ordinary phonograph turntable to record matter about one p.115 recorded upon an ordinary phonograph record disk. y r V It will, of course, be understood that when the pick-up arm 21 is to be used the'lever 15 and the partscarried thereby are swung to one side out of the way and vice versa.

Having thus described the invention, I

claim An attachment for radio-receiving sets comprising a turntable to carry a disk, an" angle lever mounted at the rear of the turntable and having one arm extending over the turntable and another arm extending under the turntable, a stylus carried by the free end of the lever to rest on adisk carried'flo by the turntable, a threaded shaft below the turntable, a nut carried by the lever under the turntable and engaged Withsaid. threaded shaft, means for rotating the turntable,

means for rotating the threaded shaft in consonance with the turntable, and means for pivotally shifting the shaft about the center of the turntable as the turntable and shaft rotate.

In testimon whereof I aflix m signature.

RIC ARD M. GRAI [1,. 5.] 

